US5311092A - Lightweight high power electromagnetic transducer - Google Patents

Lightweight high power electromagnetic transducer Download PDF

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Publication number
US5311092A
US5311092A US07596371 US59637190A US5311092A US 5311092 A US5311092 A US 5311092A US 07596371 US07596371 US 07596371 US 59637190 A US59637190 A US 59637190A US 5311092 A US5311092 A US 5311092A
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means
armature
magnetic flux
flux
flux carrying
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US07596371
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Gene A. Fisher
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UQM TECHNOLOGIES Inc
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Unique Mobility Inc
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/02Details of the magnetic circuit characterised by the magnetic material
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • H02K1/165Shape, form or location of the slots
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K23/00DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/56Motors or generators having iron cores separated from armature winding
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/46Fastening of windings on the stator or rotor structure
    • H02K3/47Air-gap windings, i.e. iron-free windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • H02K33/04Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation
    • H02K33/06Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation with polarised armatures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/18Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K41/00Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02Linear motors; Sectional motors
    • H02K41/03Synchronous motors; Motors moving step by step; Reluctance motors

Abstract

An electromagnetic transducer is disclosed that is lightweight and has a high power to weight ratio, with the transducer being capable of operation as an efficient motor, alternator or generator, and being particularly useful, for example, in connection with self-propelled vehicle applications such as passenger cars. The electromagnetic transducer can utilize a shell construction, which enhances heat removal, and includes a magnetic-flux producing assembly, having a plurality of spaced magnetic elements, and an armature assembly formed by a winding arrangement of dispersed conductive elements which are separated by flux carrying elements which, to the extent that such flux carrying elements are electrically conductive, are dispersed in one, two or three dimensions to thus be dispersed-phase flux carrying elements. The armature conductors and flux carrying elements are dispersed to minimize creation of opposing induced current, or eddy currents, depending on the effect produced on transducer operation. This dispersal enables operation of the transducer at high efficiency with high torque being maintained even during high speed relative motion between the magnetic flux producing assembly and the armature with the combination of high torque and high speed producing higher power per unit weight than can now known devices.

Description

This is a continuation of application Ser. No. 125,781 filed Nov. 27, 1987 U.S. Pat. No. 5,004,944 which in turn is a continuation of Ser. No. 812,306, filed Dec. 23, 1985 now abandoned.

FIELD OF THE INVENTION

This invention relates to an electromagnetic transducer, and, more particularly relates to a lightweight high power electromagnetic transducer capable of use as a motor, alternator or generator.

BACKGROUND OF THE INVENTION

Electromagnetic transducers are known for use both in transforming electrical power into mechanical power and transforming mechanical power into electrical power. In both cases, power producing capability results due to relative movement between magnetic elements and electrically conductive elements, as is well known, for example, in the application of this phenomenon to motors, alternators and generators.

While it is well known that motor, alternator and generator devices can be made that are quite light in weight, and while at least some known lightweight devices have been capable of operation at high speeds, such devices have not been capable of operation at high speeds to produce high power. For example, high power density devices of 0.6 horsepower per pound of weight are known for intermittent operation, but such devices are incapable of continuous operation at high power densities in excess of 1.0 horsepower per pound.

Known electromagnetic transducer devices have also not been capable of simultaneous high speed and high torque operation and/or have not provided adequate efficiency in operation. In addition, prior shell construction devices have not used both dispersed conductors and dispersed phase flux carrying means in the armature and have, therefore, also been limited to low speed, which, even at high torque, leads to low power density.

It is also well known that an electromagnetic transducer can include a stator and rotor arrangement, and that such an arrangement can include positioning magnetic elements on the rotor (see, for example, U.S. Pat. Nos. 3,663,850, 3,858,071, and 4,451,749), as well as on the stator (see, for example, U.S. Pat. Nos. 3,102,964, 3,312,846, 3,602,749, 3,729,642 and 4,114,057). It has also been heretofore suggested that a double set of polar pieces could be utilized (see, for example, U.S. Pat. No. 4,517,484).

In addition, a shell type rotor has been heretofore suggested (see, for example, U.S. Pat. Nos. 295,368, 3,845,338 and 4,398,167), and a double shell rotor arrangement has also been suggested (see, for example, U.S. Pat. No. 3,134,037).

It has also been heretofore suggested that a bundle of wires can be utilized in place of a single conductor in the armature assembly of a motor (see, for example, U.S. Pat. Nos. 497,001, 1,227,185, 3,014,139, 3,128,402, 3,538,364 and 4,321,494, as well as British Patent No. 9,557) with such wires being stated to be for high voltage and high current usage and/or to reduce current flow loss, the so-called skin effect, and heating due to eddy currents, and with such wires being utilized in conjunction with solid and/or laminated cores (see, for example, U.S. Pat. Nos. 3,014,139, 3,128,402, and British Patent No. 9,557).

It has also been heretofore suggested than an electromagnetic transducer could have a power to weight ratio of up to about one horsepower to one pound (see, for example, U.S. Pat. No. 3,275,683). In addition, cooling of a motor, to increase power handling capability, using a gas, liquid, or a mixture of a gas and liquid, is well known (see, for example, U.S. Pat. No. 4,128,364).

While various arrangements for electromagnetic transducers have therefore been heretofore suggested and/or utilized, such transducers have not been found to be completely successful for at least some uses, including providing a lightweight transducer that is capable of providing high power.

In particular, the prior art does not teach the necessity to disperse the conductors to enable high speed operation, due, at least in part, to a widely taught theory that the magnetic field is very low in the conductors. With conductors built according to conventional teachings, however, it has been found that torque, at constant current, decreases with increasing speed, which result is contrary to the conventional expectation that torque would remain high as speed increases (which is the result achieved by this invention).

SUMMARY OF THE INVENTION

This invention provides an improved electromagnetic transducer that is lightweight and yet provides high power conversion due to the high power density capability of the transducer, with the transducer being capable of operation as a highly efficient motor, alternator or generator, with the transducer of this invention being capable or continuous operation at high power densities in excess of 1.0 horsepower per pound.

High power density per unit weight is effected by utilization of an armature assembly having dispersed conductors which are separated by dispersed-phase flux carrying elements in a manner such that low opposing induced currents are created, as well as low eddy currents, to enable operation of the transducer at high efficiency with high torque being maintainable during high speed operation.

As the armature moves relative to a magnetic flux producing assembly, currents (which are often referred to as eddy currents) are established in the electrically conductive portions of the armature and these currents lead to heating and skin effects (which are collectively known as eddy current losses). However, these currents also produce another effect not heretofore realized, which currents are herein referred to as opposing induced currents since these currents alter the magnetic flux pattern and act to reduce the torque with speed increase. This power conversion capability reduction with speed increase can occur even when the losses due to these currents are acceptable, and conventional practice would not suggest dispersing the conductors as has been done in the electromagnetic transducer of this invention.

It is therefore an object of this invention to provide an improved electromagnetic transducer.

It is another object of this invention to provide an improved electromagnetic transducer that is lightweight and yet provides high power so that the transducer has high power density.

It is still another object of this invention to provide an improved electromagnetic transducer that operates at high efficiency.

It is still another object of this invention to provide an improved electromagnetic transducer having high power density per unit weight capability.

It is still another object of this invention to provide an improved electromagnetic transducer having a high power to weight ratio.

It is still another object of this invention to provide an improved electromagnetic transducer capable of use as a highly efficient motor, alternator or generator.

It is still another object of this invention to provide an improved electromagnetic transducer that is capable of continuous operation at high power densities in excess of one horsepower per pound.

It is still another object of this invention to provide an improved electromagnetic transducer having an armature assembly with dispersed conductors different sections of which have flux carrying elements positioned therebetween with the conductors and flux carrying elements being formed and positioned in a manner so as to create low opposing induced currents.

It is still another object of this invention to provide an improved electromagnetic transducer having an optimum thickness armature assembly which represents a balance among the effects of heat transfer to the cooling medium, heat production from resistance heating and other sources, and torque production.

With these and other objects in view, which will become apparent to one skilled in the art as the description proceeds, this invention resides in the novel construction, combination, and arrangement of parts substantially as hereinafter described, and more particularly defined by the appended claims, it being understood that changes in the precise embodiments of the herein disclosed invention are meant to be included as come within the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate complete embodiments of the invention according to the best mode so far devised for the practical application of the principles thereof, and in which:

FIG. 1 is an exploded isometric view of a rotary implementation of the electromagnetic transducer of this invention;

FIG. 2 is a side sectional view of the assembled electromagnetic transducer as shown in FIG. 1, along with additional elements illustrated in block form to better illustrate the invention;

FIG. 3 is a partial isometric view illustrating use of the electromagnetic transducer of this device configured as a traction motor to drive a wheel of an associated vehicle;

FIG. 4 is a partial isometric view showing the arrangement of the dispersed conductors and flux carrying elements of the electromagnetic transducer shown in FIGS. 1 and 2;

FIG. 5 is a diagram illustrating a typical arrangement of a two layer winding formed by the dispersed conductors and illustrating the flux carrying elements positioned between turns of the windings;

FIG. 6 is a sectional view taken through lines 6--6 of FIG. 2, with the magnetic flux path in the transducer also being illustrated;

FIG. 7 is a partially cut-away view similar to that of FIG. 6 but illustrating an alternate embodiment of the electromagnetic transducer of this invention;

FIG. 8 is a partially cut-away view similar to that of FIG. 6 but illustrating another alternate embodiment of the electromagnetic transducer of this invention;

FIG. 9 is a partial cut-away view similar to that of FIG. 6 but illustrating still another alternate embodiment of the electromagnetic transducer of this invention;

FIG. 10 is a partial cut-away view similar to that of FIG. 6 but illustrating yet another alternate embodiment of the electromagnetic transducer of this invention;

FIG. 11 is a partial end view illustrating a dispersed conductor, as best shown in FIG. 4, and illustrating the insulation layer around the conductor;

FIG. 12 is an end view similar to that of FIG. 11 but illustrating an alternate embodiment of the armature structure wherein the conductors have a coating of a flux carrying means (iron) thereon utilizable in lieu of the flux carrying elements as illustrated in FIGS. 4 through 10;

FIG. 13 is an end view similar to that of FIGS. 11 and 12 but illustrating another alternate embodiment of the armature structure wherein insulated conductors have a coating of a flux carrying means (iron) thereon utilizable in lieu of the flux carrying elements as illustrated in FIGS. 4 through 10;

FIG. 14 is a partial view illustrating the use of the embodiment of either FIG. 12 or FIG. 13 as the armature without use of separate flux carrying elements;

FIG. 15 is a partial view similar to that of FIG. 14 but illustrating use of alternating sections of dispersed conductors and dispersed conductors coated as shown in the embodiment of FIG. 12 or FIG. 13;

FIG. 16 is a side sectional view of an alternate embodiment of the electromagnetic transducer as shown in FIG. 2, and illustrates the armature fixed to the shaft as may be convenient to a brush commutated transducer;

FIG. 17 is an exploded isometric view of another alternate embodiment of the electromagnetic transducer of this invention, and illustrates a cylindrically symmetric linear implementation thereof;

FIG. 18 is an exploded isometric view of still another alternate embodiment of the electromagnetic transducer of this invention, and illustrates a flat linear implementation thereof;

FIG. 19 is a graph illustrating the relationship between torque and speed for a conventional transducer b and for the transducer of this invention a; and

FIG. 20 is a graph illustrating tested eddy current, hysteresis and windage losses at different speeds of one example of the transducer of this invention.

DESCRIPTION OF THE INVENTION

A novel electromagnetic transducer is particularly described herein, including alternate embodiments thereof. It is meant to be realized that the electromagnetic transducer of this invention may be utilized as a motor (ac or dc), alternator or generator, depending on whether an electrical signal is conveyed to the armature (commonly through a commutator or equivalent structure), to create a force causing movement of the magnetic flux producing structure relative to the armature thus driving the shaft, or whether the shaft is rotated to thereby cause movement of the magnetic flux producing structure relative to the armature to create an electromotive force which, in turn, can cause movement of current along the conductors of the armature to be coupled from the conductors as an electrical signal, as is well known.

Electromagnetic transducer 35, as best shown in FIGS. 1 and 2, is lightweight and yet is capable of delivering high power, with the transducer being a high power density device that is particularly well suited, for example, for use in conjunction with self-propelled vehicle applications, such as passenger cars, although the invention is not meant to be restricted thereto.

When used for vehicle propulsion, a permanent magnet, hollow cylinder electromagnetic transducer 35 may be utilized as an efficient wheel mounted traction motor, and may, as indicated in FIG. 3, be mounted directly at each wheel 37, adjacent to axle 39, with drive being preferably achieved through gear reduction mechanism 41.

As shown in FIGS. 1 and 2, electromagnetic transducer 35 includes an outer cylindrical housing 43, which housing has front and rear end plates 45 and 46 positioned at the opposite ends of the cylindrical housing by means of snap rings 48 and 49.

A shaft 51 has a central portion 52 extending through the cylindrical housing with the shaft being mounted in central hubs 54 and 55 of end plates 45 and 46, respectively, by means of bearings 57 and 58 so that the central portion of the shaft is coaxially positioned with respect to the cylindrical housing, the reduced diameter rear portion 60 of the shaft is mounted in bearing 58, and the front portion 62 of the shaft extends forwardly of front end plate 45, with seal 64 being positioned in hub 54 adjacent to bearing 57.

As also shown in FIG. 2, blower 65 is positioned adjacent to back, or rear, end plate 46, which plate includes offset air intake aperture 66 and a plurality of exhaust apertures 67 spaced about and near the periphery of the end plate. When so used, the transducer thus operates in a gas (air) medium (as opposed to a fluid medium which could include oil or the like, for example, as do some known transducers). In addition, an arcuate aperture 68 is positioned to allow armature conductor connections through end plate 46.

As best shown in FIG. 2, rotor 70 has a double shell configuration provided by inner and outer spaced cylindrical portions 72 and 73 which extend normally from mounting disk 75 so that cylindrical portions 72 and 73 are coaxial with, and inside, cylindrical housing 43 and define an annular gap 72A therebetween. Mounting disk 75 has an annular mounting portion 77 which is received on splined portion 78 of shaft 51 inwardly of bearing 57.

Inner cylindrical portion 72 of rotor 70 has magnetic elements 80 mounted thereon, which magnetic elements are shown to be permanent magnets (but electromagnets could be utilized, if desired). Inner and outer walls 72 and 73, respectively, are formed of highly magnetically permeable with low hysteresis loss magnetic material (such as iron or steel, for example), and mounting disk 75 is formed of non-magnetic material (such as plastic or aluminum, for example), while magnetic elements 80 are high strength permanent magnets, which magnets are preferably formed of neodymium boron ferrite (NdFeB), but may also be formed of barium ferrite ceramic (BaFe Ceramic), samarium cobalt (SmCo), or the like.

Armature 82 comprises an annular member at least partially disposed within gap 72A and is fixed with respect to housing 43, and is mounted on rear end plate 46, as indicated in FIG. 2, so that rotor 70 rotates relative to armature 82 (as well as to housing 43). Armature 82 is thus a stationary cylindrical shell element that extends through the length of cylindrical housing 43 between the inner and outer cylindrical walls 72 and 73 of the rotor.

It is important to this invention that armature 82 include dispersed conductors 84, as best shown in FIG. 4, different sections 85 of which are positioned between flux carrying elements 80 as best shown in FIG. 6. The conductors 84 have discrete, spaced apart active regions 84A, as shown in FIGS. 4 and 5. As shown in FIG. 6, active regions 84A have a substantially rectangular cross-section. Between active regions 84A are a plurality of discrete elongated open space areas 86A (see FIGS. 5 and 6). A flux carrying means formed of a plurality of flux carrying members 86 of compressed iron powder are interposed in open space areas 86A between active regions 84A. Dispersed conductors 84 are preferably formed from a bundle of small diameter copper wires 87 surrounded by insulating material 88 (as best shown in FIG. 11), with conductors 84 being wound into a linking pattern, as indicated by way of example in FIG. 5, with the opposite ends of the wire bundles being connected to connectors 89 extending through aperture 68 in end plate 46, as indicated in FIG. 2.

conductors 84, as best shown in FIG. 4, are formed into a bundle throughout the armature (as by being wound in a ring, for example), and each turn of the wire windings has a flux carrying element 86 therebetween, as shown in FIGS. 5 and 6, with a typical winding which constitutes a structurally integral annular winding structure, being conceptually illustrated in FIG. 5.

Flux carrying elements 86 are preferably iron (at least in part), and extend between the active region or length 84A of conductors 84. Elements 86 have radially inner 86B and radially outer 86C elongated edges (see FIG. 5). Conductors 84 also have flat end turns 84B at which the winding conductors 84 are reversed in direction (see FIGS. 4 and 5) that extend beyond the active lengths 84A to connect the active lengths to each other in an appropriate pattern, such as a wave winding as shown, by way of example, in FIG. 5. The flux carrying elements 86 are preferably dispersed-phase flux carrying members to handle the high frequency magnetic field reversals with low opposing induced currents and low eddy current losses. Because iron is electrically conductive, it must be dispersed to avoid (or at least minimize) the creation of opposing induced currents. It has been found that a suitable flux carrying element 86 can be pressed from fine (10-100 m kron) iron powder previously reactively coated with phosphate insulation and using "B" stage epoxy and wax as binders.

By providing conductors comprising a plurality of small diameter wires with dispersed-phase flux carrying elements between turns of the wires, opposing induced currents are minimized sufficiently so as to allow operation of the electromagnetic transducer at high speeds and at high torque with such operation being conductable at high efficiency. In a working embodiment, a stationary armature shell incorporating windings of copper with powdered iron bars to carry the magnetic flux, and permeated with glass re-enforced novolac epoxy insulation material cast as a bonding agent 180 between the windings and bars, has been successfully utilized.

In this invention when used as a motor, at constant current, it has been found that the torque output can be maintained nearly constant even with increases in rotor speed, as illustrated in FIG. 19 by line a. This is quite unlike prior art devices wherein torque was found to drop off rapidly with increased speed when solid bars were utilized as conductors and as flux carrying elements, as illustrated in FIG. 19 by line b. The combination of high torque and high speed, made possible in the electromagnetic transducer of this invention, produces high power density.

As shown in FIG. 6, armature 82 (formed by the dispersed conductors 84 and flux carrying members 86) are closely spaced with respect to magnets 80 positioned about the inner cylindrical wall 72, and also closely spaced with respect to cylindrical wall 73, with walls 72 and 73 providing inner and outer return paths, respectively, for the magnetic flux. Some typical flux paths have been illustrated in FIG. 6. As shown, these flux paths are loops each of which penetrates the armature twice passing principally through the flux carrying members 86. The flux carrying members thus allow a thick armature to maintain a high flux density which is essential to high torque.

As indicated in FIG. 7, the electromagnetic transducer may also be configured by placing magnets 80 on outer wall 73 (rather than on inner wall 72). As indicated in FIG. 8, the electromagnetic transducer may also be configured by placing magnets 80 on both inner and outer walls 72 and 73.

As indicated in FIG. 9, an armature 82 can also be provided at both sides of magnets 80. In addition, while not specifically shown, it is also to be realized that the electromagnetic transducer could be configured by placing additional layers of armature-rotor elements radially inwardly and/or outwardly of that shown in the drawings. While flux carrying members 86 in the above embodiment are rectangular in cross-section, the flux carrying members may also be configured by utilizing a non-rectangularly shaped member such as, for example, an l-shaped member 91 (as indicated in FIG. 10) having dispersed conductors 84 extending therebetween.

The armature can also be configured as shown in FIG. 12 such that flux carrying elements 93 are formed as a coating of highly permeable magnetic material (such as iron) on some or all of the dispersed conductors 94. As indicated in FIG. 13, conductors 94 can also have an insulation layer 95 thereon so that insulation layer 95 is between the conductor and the flux carrying element. In either case, an insulating layer 96 covers the flux carrying element (unless it is, of itself, electrically non-conductive).

When the flux carrying elements are formed as coatings on the dispersed conductors (as indicated in FIGS. 12 and 13), the flux carrying bars (shown in FIGS. 4 through 10) need not be utilized. The dispersed conductors 94 with the flux carrying elements coated thereon can be utilized as the only elements of the armature (as indicated in FIG. 14) or can be alternated with dispersed conductor sections 85, i.e., dispersed conductors having no flux carrying element coating thereon (as indicated in FIG. 15).

Powdered iron utilized as flux carrying elements 86 (as indicated in FIG. 6) provide three-dimensional phase dispersion, while flux carrying elements 93 coated on the dispersed conductors (as indicated in FIGS. 12 and 13) provide two-dimensional phase dispersion (iron lamination bars, on the other hand, when used as flux carrying elements provide only one-dimensional phase dispersion).

The electromagnetic transducer of this invention thus includes a magnetic flux producing assembly (having at least one pair of poles which can be embodied by using permanent magnets or electromagnets), and an armature assembly (which intercepts the magnetic flux produced by the magnetic flux producing assembly and has an alternating structure of conductive windings and flux carrying elements, which flux carrying elements can be referred to as armature iron). A winding can be used as the principal component of the armature with the winding consisting of bundles of separate conductors (which are referred to herein as dispersed conductors), with the use of dispersed conductors of fine wire permitting high speed rotation of the rotor when used in conjunction with dispersed-phase flux carrying elements.

The use of multiple, parallel extending, insulated conductors to reduce heating losses at high currents has been heretofore suggested (see, for example, U.S. Pat. No. 497,001), and it is well known in the motor art as a method to reduce skin effect losses in motors. Skin effect, however, causes losses at load only, whereas eddy current losses, which would be experienced when known devices are rotated at high speed, occur at no load. This distinction is as to the mechanism of the effect.

In the case of conductors of large cross section of conductive flux carrying elements of large cross section, as used at least in some prior known devices, as the frequency of the magnetic field reversal increases, the magnitude of the induced currents in the bars increases, and the induced currents react with the magnetic field to create a resisting torque which opposes the increase of rotational speed. Thus, known shell type devices are inherently limited to low speed by the reaction torque, and cannot be rotated at high speed and are therefore unlike the device of the present invention, not suitable, for example, for use as traction motors in most practical applications.

When used as a motor, a means to displace (i.e., rotate) the magnetic field relative to the armature at high speed must, of course, also be provided so that electric power can be converted into mechanical power in a manner similar to that used by known motors. As indicated in FIG. 2, this can be accomplished by connecting leads 97 between connectors 89 of armature 82 and current generator and controller unit 98 so that unit 98 which provides current to conductors (see FIG. 10) to cause rotation of rotor 70, with rotation of rotor 70 causing rotation of shaft 51 to drive a load/actuator 99.

When used as an alternator or generator, load/actuator 99 causes rotation of shaft 51 which rotates rotor 70 to induce a voltage on conductors 84 and thereby generates electrical current flow from conductors 84 to a load 98. While not specifically shown in FIGS. 1 through 15, it is to be realized that the current generator and controller unit (or alternately the armature; includes necessary electric commutation devices, including those devices wherein commutation is performed electronically (as in a brushless DC motor, for example), as well as those devices which employ rectifiers instead of commutation (as is often used in power generating applications).

FIG. 16 illustrates an embodiment of the electromagnetic transducer of this invention in which armature 82 is connected with shaft 51, and inner and outer cylindrical walls 72 and 73 are fixed to housing 43. In this embodiment, the armature thus becomes the rotor with electric power being communicated with the armature by means of brushes 102, slip rings (not identified in FIG. 16) (with brushes being utilized in the case of a DC machine, and slip rings being utilized in the case of an AC machine). The embodiment shown in FIG. 16 is preferred for some applications, particularly in the case of a DC commutated machine.

The transducer of this invention has a significant advantage over a conventional motor by utilization of a minimum amount of iron which undergoes flux reversal. That is, only the iron in the flux carrying elements in the armature is subject to the reversing flux as each pole is passed, and thus low hysteresis losses are experienced. In addition, the effects of flux leakage are reduced so that all of the armature windings experience the total flux change and thus are equally useful at producing torque.

The device of this invention also has significant heat transfer advantages. For this reason, the superior high power to weight ratio is further enhanced. A thin armature is made possible by the armature being made up entirely of insulated conductors except for the necessary volume of the flux carrying members. It is therefore possible to provide cooling to both the inner and outer surfaces of the armature.

By the principles of heat transfer, heat buildup in an armature, with constant surface temperature and uniform internal heating per unit volume, depends on the square of its thickness. For example, compare an armature 0.25 inches thick (as is possible in this invention) to a solid rotor, five inches in diameter (as is common in known devices). The heat buildup in such known devices is some 400 times as great as that of the transducer of this invention with such an armature. Clearly, the electromagnetic transducer of this invention can dissipate more heat than any known conventional transducer of similar power rating.

The electromagnetic transducer of this invention can be produced in several topological variations of the basic design. In addition to the rotating cylindrical shell configuration, by changing the orientation of the magnets and the windings, the motor can be made to produce a linear motion. Other variations (not shown) include pancake and conical configurations.

FIG. 17 illustrates a linear reciprocating implementation of the electromagnetic transducer of this invention wherein the magnetic flux producing section moves linearly with respect to the armature in a cylindrical configuration. To accomplish this end, armature 105 has dispersed conductors 106 and flux carrying elements 107 wound radially about shaft 51 (rather than extending parallel thereto as in the embodiment shown in FIG. 1), and rotor 109 has magnets 110 thereon that extend circumferentially around inner cylindrical wall 72 (rather than extending parallel to shaft 51 as in the embodiment shown in FIG. 1).

FIG. 18 illustrates another linear reciprocating implementation of the electromagnetic transducer of this invention in which the structure is flat. As shown, magnets 113 are mounted on flat lower return plate 114. Armature 115 is provided with dispersed conductors 116 and flux carrying elements 117 in the same manner as described hereinabove with respect to the other embodiments illustrated except that the armature is essentially flat rather than cylindrical. An upper return plate 118 is also provided, and armature 115 is movable linearly with respect to, and between, lower and upper plates 114 and 118 by means of rollers 120 mounted on the edges of upper plate 118 and rollers 121 mounted in roller mounting boxes 122 (carried by lower plate 114).

The basic configuration and geometry of a prototype transducer constructed according to the principles of this invention and based upon computer calculations are as follows (based upon the use of 24 magnets, conductors 0.008 inches in diameter, and 144 flux carrying elements as brought out more fully hereinafter):

______________________________________Power (at 10,000 rpm)     40 HPVoltage                   72 volts dcCurrent                  425 amps dcDiameter                 6.5 inchesArmature total thickness                   0.28 inchesLength                   3.5 inchesWeight                  15.0 lbs.Efficiency (calculated at 10,000 rpm)                   97.6%______________________________________

More specifically, the motor calculations as set forth hereinabove are based upon the following motor calculations:

______________________________________Geometric ParametersL1 = .125   L2 = .02  L3 = .25  L4 = .02L5 = .3 L6 = .125 L9 = 2    R1 = 2.488M1 = .684   M2 = .513 M3 = .171 M5 = .109                               M6 = .054X1 = .5 M4 = .75Material PropertiesR9 = .075 U9 = .0000004                 DE = .054  R0 = 1.7241BR = 11500     UR = 1.05   HD = 5000  RD = .3WD = .323 RM = .000001                 N1 = 2Winding VariablesDW =        PF = .42 VO = 72  RM = 425                                 NP = 38.000001E-03 or .008RM = 24     NS = 2   NL = 2   SR = 1  YD = 2NT = 1      M1 = 2Magnetic FieldsBA = 8000 BM = 10053 HM =  1378  BS = 16666B - Inner RP = 151dl            B - Outer RP = 17136B - back at 425 amps = 754            Max current at HD = 2042P(1) = 7.3     P(2) = 1.2 P(3) = .3   P(4) = 3.7Weights of the Component PartsCopper = .72 Epoxy = .30    Magnets = 2.22Stator iron = 1.11        Return paths = 2.32                       Housing = 5.87Shaft = 2.46 Total weight = 15.0Electrical ParametersResistance = .0027          R per phase = .004No load speed = 11164.7 rpmPt-lb at stall (36154 amps) = 1644Wires/conductor = 56          Effective length = 48Stat. vol = 7.8          Conductor size is 0.054 by 0.125______________________________________Calculated Performance as a Function of SpeedLosses in wattsrpm   ft-lb  amps   I.sup.2 R                    eddy  hyst's                                wind hp   eff (%)______________________________________1116  19.3   425    359.6                    2.5   9.3   .1   4.1  89.22233  19.3   425    359.6                    10.2  18.6  .6   8.2  943349  19.3   425    359.6                    22.9  27.9  1.3  12.3 95.74466  19.3   425    359.6                    40.7  37.2  2.6  16.4 96.55582  19.3   425    359.6                    63.6  46.5  4.3  20.5 976699  19.3   425    359.6                    91.6  55.6  6.6  24.6 97.37815  19.3   425    359.6                    124.6 65.1  13.3 28.7 97.48932  19.3   425    359.6                    162.8 74.4  18.6 32.9 97.610048 19.3   425    359.6                    206   83.7  25   37   97.611033 19.3   425    359.6                    248.4 91.9  31.7 40.6 97.611099  9.7   213     89.9                    251.3 92.5  32.2 20.4 97______________________________________wherein:Units of length are inchesFields are in Gauss B, Oersteds HLosses are in wattsForces are lb as are weightsP( ) = Gauss-in/Oersted, permeances of the flux pathsR = Resistance, ohmsand wherein:______________________________________Parameter   Definition______________________________________L1      inner return path 72 thicknessL2      inner air gapL3      Armature 82 thicknessL4      Outer air gapL5      Magnet 80 thicknessL6      Outer return path 73 thicknessL9      Magnet 80 lengthMI      Option, 1 for magnets inside,   2 for out, 3 for bothM1      magnet pitchM2      magnet widthM3      gap between magnets at pitch lineM4      M2 as a fraction of M3M5      Armature iron pitchM6      Armature iron widthXI      Iron fractionNS      Iron pieces (flux carrying elements) 86 per phase and   per poleNT      # of conductors 84 per iron piece 86NL      # of layers of windingNC      Total # of conductors 84 per phaseSR      # of conductors per phase in seriesNP      # of phasesYD      Option, 1 for wye and 2 for deltaNW      # of wires per conductorNM      # of magnets 80PF      wire packing factorDW      wire diameterWD      density of wire materialDE      density of epoxy potting materialVO      Applied voltageIM      Maximum current   NR is no load speedR1      Mean armature radiusRO      wire resistivity, microohm-cm______________________________________

For motor torque verification, the electromagnetic force was measured in an actual test in a linear configuration similar to that illustrated in FIG. 18, built to test computer simulation of a rotary configuration. A current of 125 amps produced a force of 50 lb.

The measured magnetic field (using Type 8 ceramic magnets) was 3500 gauss. The active conductor length spanned three of the four poles and consisted of twenty bars of copper, each 0.150×0.3125 inches in cross section. Each of the 3×20=60 conductors had an active length of three inches. Thus the total active conductor length was 3×60=180 inches. Using these values, the force was calculated to be 45 lb. The measured force of 50 lb compares well with the calculated force of 45 lb considering the accuracy of the test (for example, the magnetic field is not absolutely uniform everywhere, and fringing field effects were not considered).

Measured eddy current, hysteresis and windage losses for a transducer constructed according to the principles and description herein are shown in the graph of FIG. 20. This motor delivered 16 horsepower at 7800 RPM in preliminary testing.

As can be appreciated from the foregoing, the electromagnetic transducer of this invention is thus able to provide an output power to weight ratio that is greater than one horsepower to one pound in a cooling gas medium (using air as the cooling medium), and is believed to be greater than five horsepower to one pound in at least some cooling mediums (with a five to one ratio being calculated for the prototype motor as set forth herein). It should be further appreciated from the foregoing that this invention provides an improved electromagnetic transducer that is lightweight, compact, efficient and yet capable of delivering high power.

Claims (5)

What is claimed is:
1. An electromagnetic transducer, comprising:
(a) magnetic flux producing means of high energy permanent magnets for producing a magnetic flux;
(b) an armature means for intercepting said magnetic flux, said armature means including conductor means having a plurality of discrete active regions for carrying electrical current and which are spaced apart and have a substantially rectangular cross-section to provide a plurality of discrete elongated open space areas between said active regions,
said active regions comprising a plurality of parallel conductive wires insulated from one another, said conductive wires having a diameter on the order of 0.008",
magnetic flux carrying means comprising a multiplicity of discrete flux carrying members formed of non-sintered highly compressed iron powder particles interposed between said active regions of said conductor means,
said flux carrying members containing a bonding agent to hold together said flux carrying means and a bonding agent to bond said flux carrying means and said conductor means;
(c) a movable member having one of said magnetic flux producing means and said armature means secured thereto; and
(d) means for mounting another of said magnetic flux producing means and said armature means to allow said movable member to move relative thereto, whereby said magnetic flux producing means and said armature means are able to move relative to one another.
2. A high-speed, high torque electromagnetic transducer comprising:
a housing;
a shaft mounted on said housing to rotate relative thereto;
a magnetic field generating rotor secured to said shaft to rotate therewith, said rotor having a mounting disk connected to said shaft and one of a first annular wall means having a cylindrical first magnetic means mounted thereon for generating a magnetic flux and a second annular wall means comprising an outer annular wall and an inner annular wall; both said inner and outer annular walls being supported by said mounting disk and spaced radially apart to define an annular gap therebetween, said inner annular wall being spaced radially apart from said shaft, and a second means for generating a magnetic flux mounted on at least one of said inner and outer annular walls;
an armature for intercepting and dispersing a phase of said magnetic flux, said armature fixed to said housing, said armature comprising an annular winding structure comprising winding conductors and having a generally cylindrical shape with two flat ends at which the winding conductors are reversed in direction, an active area between said flat ends; a plurality of circumferentially spaced discrete elongated openings in said active area; a plurality of discrete elongated dispersed phase magnetic flux carrying members pressed powdered iron particles inserted into said elongated openings so as to act as dispersed phase magnetic flux carrying means; said dispersed phase magnetic flux carrying members radially inner and radially outer elongated edges; a bonding agent surrounding said winding structure and said dispersed phase magnetic flux carrying members; and
means for mounting said armature to allow said rotor to move relative thereto, whereby said rotor and said armature are rotated relative to each other and to said housing to provide high power output.
3. An electromagnetic transducer, comprising:
(a) magnetic flux producing said means for producing said magnetic flux;
(b) an armature means for intercepting said magnetic flux, said armature means including conductor means having a plurality of discrete active regions for carrying electrical current which are spaced apart and have a substantially rectangular cross-section to provide a plurality of discrete elongated open space areas between said active regions,
said active regions comprising a plurality of parallel conductive wires insulated from one another,
magnetic flux carrying means comprising a multiplicity of discrete flux carrying members formed of compressed fine iron powder particles of diameter generally from 10-100 microns, said particles being reactively coated with phosphate insulation,
said flux carrying members being interposed between said active regions of said conductor means, and a bonding agent comprising wax to hold together said flux carrying means and said conductor means;
(c) a movable member having one of said magnetic flux producing means and said armature means secured thereto; and
(d) means for mounting the other of said magnetic flux producing means and said armature means to allow said movable member to move relative thereto, whereby said magnetic flux producing means and said armature means are able to move relative to one another.
4. An electromagnetic transducer, comprising:
(a) magnetic flux producing means of high energy permanent magnets for producing a magnetic flux;
(b) an armature means for intercepting said magnetic flux, said armature means including conductor means having a plurality of discrete active regions for carrying electrical current and which are spaced apart and have a substantially rectangular cross-section to provide a plurality of discrete elongated open space areas between said active regions,
said active regions comprising a plurality of parallel conductive wires insulated from one another,
magnetic flux carrying means comprising a multiplicity of discrete flux carrying members formed of non-sintered highly compressed iron powder particles interposed between said active regions of said conductor means,
said flux carrying members containing a bonding agent to hold together said fluxing carrying means and a bonding agent to bond said flux carrying means, said compressed iron powder particles being 10-100 microns in diameter, and said bonding agent comprising epoxy;
(c) a movable member having one of said magnetic flux producing means and said armature means secured thereto; and
(d) means for mounting another of said magnetic flux producing means and said armature means to allow said movable member to move relative thereto, whereby said magnetic flux producing means and said armature means are able to move relative to one another.
5. A high-speed, high torque electromagnetic transducer comprising:
a housing;
a shaft mounted on said housing to rotate relative thereto;
a magnetic field generating rotor secured to said shaft to rotate therewith, said rotor having a mounting disk connected to said shaft and one of a first annular wall means having a cylindrical first magnetic means mounted thereon for generating a magnetic flux and a second annular wall means comprising an outer annular wall and an inner annular wall; both said inner and outer annular walls being supported by said mounting disk and spaced radially apart to define an annular gap therebetween, said inner annular wall being spaced radially apart from said shaft, and a second magnetic means for generating a magnetic flux mounted on at least one of said inner and outer annular walls;
an armature for intercepting and dispersing a phase of said magnetic flux, said armature fixed to said housing, said armature comprising an annular winding structure comprising winding conductors and having a generally cylindrical shape with two flat ends at which the winding conductors are reversed in direction, an active area between said flat ends; a plurality of circumferentially spaced discrete elongated openings in said active area; a bonding agent surrounding said winding structure; and
means for mounting said armature to allow said rotor to move relative thereto, whereby said rotor and said armature are rotated relative to each other and to said housing to provide high power output.
US07596371 1985-12-23 1990-10-12 Lightweight high power electromagnetic transducer Expired - Lifetime US5311092A (en)

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Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783894A (en) * 1995-10-31 1998-07-21 Wither; Thomas A. Method and apparatus for generating electrical energy
US5864198A (en) * 1994-10-14 1999-01-26 Active Power, Inc. Brushless generator
US6037690A (en) * 1996-01-08 2000-03-14 Hill; Wolfgang Energy conversion system mounted in a wheel hub
US6049152A (en) * 1998-03-25 2000-04-11 Nissan Motor Co., Ltd. Motor/generator
US6065368A (en) * 1997-12-16 2000-05-23 Samsung Electronics Co., Ltd. Self-compensating dynamic balancer
WO2000038297A1 (en) * 1998-12-22 2000-06-29 Rush Holdings, Inc. Machine with cup-shaped armature and air gap
EP1072084A1 (en) * 1998-04-16 2001-01-31 John Patrick Ettridge Improved electric motor
US6201331B1 (en) * 1998-03-25 2001-03-13 Nissan Motor Co., Ltd. Motor/generator
DE19957008A1 (en) * 1999-11-26 2001-06-28 Sonderprojekte Anlagen & Hande Electric machine has hollow armature with at least one individual layer of one or more metals and has 'open' Fermi-surface to maximise interaction between magnetic field and electric current
US6297575B1 (en) * 1996-03-28 2001-10-02 Tai-Her Yang Combined power driven device having a three-layered electromechanical structure with common structures
US6384507B1 (en) * 1999-11-10 2002-05-07 Korea Advanced Institute Of Science & Technology Coreless AC induction motor
US20030102764A1 (en) * 2001-11-27 2003-06-05 Denso Corporation Flat rotary electric machine
US6633106B1 (en) 1999-09-30 2003-10-14 Dwight W. Swett Axial gap motor-generator for high speed operation
US20040021437A1 (en) * 2002-07-31 2004-02-05 Maslov Boris A. Adaptive electric motors and generators providing improved performance and efficiency
US6776057B1 (en) * 1999-08-12 2004-08-17 Abas, Incorporated Magnetized transducer element for torque or force sensor
US20040232704A1 (en) * 2001-09-13 2004-11-25 Matteo Casazza Wind power generator
US20040263099A1 (en) * 2002-07-31 2004-12-30 Maslov Boris A Electric propulsion system
US20050045392A1 (en) * 2002-07-31 2005-03-03 Maslov Boris A. In-wheel electric motors
US20050046375A1 (en) * 2002-07-31 2005-03-03 Maslov Boris A. Software-based adaptive control system for electric motors and generators
US6891302B1 (en) 2000-09-23 2005-05-10 Christopher W. Gabrys Light-weight high-power electrical machine
US20050127856A1 (en) * 2002-07-31 2005-06-16 Wavecrest Laboratories Low-voltage electric motors
US20060001269A1 (en) * 2004-06-30 2006-01-05 Jansen Patrick L Electrical machine with double-sided rotor
US20060066110A1 (en) * 2004-09-27 2006-03-30 General Electric Company Electrical machine with double-sided lamination stack
US20060071575A1 (en) * 2004-09-27 2006-04-06 General Electric Company Electrical machine with double-sided stator
US20060131985A1 (en) * 2004-12-16 2006-06-22 General Electric Company Electrical machines and assemblies including a yokeless stator with modular lamination stacks
US20070103027A1 (en) * 2004-09-27 2007-05-10 Jansen Patrick L Electrical machine with double-sided lamination stack
US20070108865A1 (en) * 2004-09-27 2007-05-17 Jansen Patrick L Electrical machine with double-sided stator
US20070241623A1 (en) * 2005-08-08 2007-10-18 Caiozza Joseph C Wind driven electric generator apparatus
US20080007070A1 (en) * 2000-11-15 2008-01-10 Edelson Jonathan S Chimney turbine
US20080157613A1 (en) * 2007-01-03 2008-07-03 Terry Scott Permanent Magnet Electric Generator with Rotor Circumferentially Encircling Stator
US7402934B1 (en) * 2005-08-18 2008-07-22 Revolution Motor Company, Inc. High performance air core motor-generator winding
US7411325B1 (en) * 2004-10-20 2008-08-12 Revolution Electric Motor Company, Inc. High efficiency combination motor and drive
US20080231131A1 (en) * 2004-03-14 2008-09-25 Gabrys Christopher W Commercial Low Cost, High Efficiency Motor-Generator
US20080244895A1 (en) * 2005-09-28 2008-10-09 Itt Manufacturing Enterprises Inc. Method For Mounting Magnet Elements on a Rotor For Use In a Permanent Magnet Motor
US20090010784A1 (en) * 2007-07-06 2009-01-08 Mbs Engineering, Llc Powdered metals and structural metals having improved resistance to heat and corrosive fluids and b-stage powders for making such powdered metals
US20100026010A1 (en) * 2006-12-22 2010-02-04 High Technology Investments B.V. Multiple generator wind turbine
US7808149B2 (en) 2004-09-20 2010-10-05 Wilic S.Ar.L. Generator/electric motor, in particular for wind power plants, cable controlled plants or for hydraulic plants
US7902700B1 (en) * 2006-04-03 2011-03-08 Gabrys Christopher W Low harmonic loss brushless motor
US7936102B2 (en) 2005-11-29 2011-05-03 Wilic S.Ar.L Magnet holder for permanent magnet rotors of rotating machines
US7946591B2 (en) 2005-09-21 2011-05-24 Wilic S.Ar.L. Combined labyrinth seal and screw-type gasket bearing sealing arrangement
US8120198B2 (en) 2008-07-23 2012-02-21 Wilic S.Ar.L. Wind power turbine
US8272822B2 (en) 2009-01-30 2012-09-25 Wilic S.Ar.L. Wind power turbine blade packing and packing method
US8274170B2 (en) 2009-04-09 2012-09-25 Willic S.A.R.L. Wind power turbine including a cable bundle guide device
US8310122B2 (en) 2005-11-29 2012-11-13 Wilic S.A.R.L. Core plate stack assembly for permanent magnet rotor or rotating machines
US8319362B2 (en) 2008-11-12 2012-11-27 Wilic S.Ar.L. Wind power turbine with a cooling system
US8358189B2 (en) 2009-08-07 2013-01-22 Willic S.Ar.L. Method and apparatus for activating an electric machine, and electric machine
US8410623B2 (en) 2009-06-10 2013-04-02 Wilic S. AR. L. Wind power electricity generating system and relative control method
US20130088103A1 (en) * 2011-10-05 2013-04-11 Industrias Metalurgicas Pescarmona S.A.I.C. Y F. Synchronic Wind Turbine Generator
US8492919B2 (en) 2008-06-19 2013-07-23 Wilic S.Ar.L. Wind power generator equipped with a cooling system
US8541902B2 (en) 2010-02-04 2013-09-24 Wilic S.Ar.L. Wind power turbine electric generator cooling system and method and wind power turbine comprising such a cooling system
US8618689B2 (en) 2009-11-23 2013-12-31 Wilic S.Ar.L. Wind power turbine for generating electric energy
US8659867B2 (en) 2009-04-29 2014-02-25 Wilic S.A.R.L. Wind power system for generating electric energy
US8669685B2 (en) 2008-11-13 2014-03-11 Wilic S.Ar.L. Wind power turbine for producing electric energy
US8937397B2 (en) 2010-03-30 2015-01-20 Wilic S.A.R.L. Wind power turbine and method of removing a bearing from a wind power turbine
US8937398B2 (en) 2011-03-10 2015-01-20 Wilic S.Ar.L. Wind turbine rotary electric machine
US8957555B2 (en) 2011-03-10 2015-02-17 Wilic S.Ar.L. Wind turbine rotary electric machine
US8975770B2 (en) 2010-04-22 2015-03-10 Wilic S.Ar.L. Wind power turbine electric generator and wind power turbine equipped with an electric generator
US9006918B2 (en) 2011-03-10 2015-04-14 Wilic S.A.R.L. Wind turbine
US20150244233A1 (en) * 2012-09-13 2015-08-27 Toyota Jidosha Kabushiki Kaisha Stator of rotating electric machine

Families Citing this family (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102864B1 (en) * 1985-12-23 1999-02-26 Unique Mobility Inc Electromagnetic transducer for electromagnetic anchor the inverter and electric motor
US5319844A (en) 1985-12-23 1994-06-14 Unique Mobility, Inc. Method of making an electromagnetic transducer
US5548657A (en) * 1988-05-09 1996-08-20 Kef Audio (Uk) Limited Compound loudspeaker drive unit
GB8810943D0 (en) * 1988-05-09 1988-06-15 Kef Electronics Ltd Loudspeaker
US4900965A (en) * 1988-09-28 1990-02-13 Fisher Technology, Inc. Lightweight high power electromotive device
US4926896A (en) * 1988-12-23 1990-05-22 Dresser Industries, Inc. Sensitive electrical to mechanical transducer
US5257639A (en) * 1988-12-23 1993-11-02 Dresser Industries, Inc. Electropneumatic positioner
US5206556A (en) * 1989-08-29 1993-04-27 Mabuchi Motor Co., Ltd. Field magnet for miniature motors
JPH069578Y2 (en) * 1989-08-29 1994-03-09 マブチモーター株式会社 Field magnet for small motors
DE3933790C2 (en) * 1989-10-10 1994-03-17 Werner Anwander Electrical machine having a rotor and a stator,
US5289066A (en) * 1990-02-01 1994-02-22 Cadac Holdings Limited Stator for dynamoelectric machine
WO1991015892A1 (en) * 1990-03-30 1991-10-17 Unique Mobility, Inc. Method of making an electromagnetic transducer
GB9112059D0 (en) * 1991-06-05 1991-07-24 Jestar Ltd Electrical machines
US5212419A (en) * 1992-01-10 1993-05-18 Fisher Electric Motor Technology, Inc. Lightweight high power electromotive device
US5455473A (en) * 1992-05-11 1995-10-03 Electric Power Research Institute, Inc. Field weakening for a doubly salient motor with stator permanent magnets
JP3152405B2 (en) * 1992-06-10 2001-04-03 オークマ株式会社 Electric motor
CA2098151A1 (en) * 1992-06-11 1993-12-12 Russell S. Gurstein Air cooled floor polishing machine
US5382859A (en) * 1992-09-01 1995-01-17 Unique Mobility Stator and method of constructing same for high power density electric motors and generators
US5363937A (en) * 1992-10-19 1994-11-15 Lmc Operating Corp. Battery operated tracked vehicle
WO1994009548A1 (en) * 1992-10-19 1994-04-28 Lmc Operating Corp. Electric operated tracked vehicle
US5753989A (en) * 1993-06-14 1998-05-19 Ecoair Corp. Hybrid alternator
US5693995A (en) 1993-06-14 1997-12-02 Ecoair Corp. Hybrid alternator
US5404063A (en) * 1993-07-01 1995-04-04 Mills; Herbert W. Electromagnetic center core dynamo
US5595121A (en) * 1994-04-15 1997-01-21 The Walt Disney Company Amusement ride and self-propelled vehicle therefor
US6118186A (en) * 1994-09-14 2000-09-12 Coleman Powermate, Inc. Throttle control for small engines and other applications
US5705917A (en) * 1994-09-14 1998-01-06 Coleman Powermate, Inc. Light weight machine with rotor employing permanent magnets and consequence poles
US5929611A (en) * 1994-09-14 1999-07-27 Coleman Powermate, Inc. Light weight rotor and stator with multiple coil windings in thermal contact
US5955806A (en) * 1995-12-01 1999-09-21 Raytheon Company Torque motor with combined shield ring and rotor ring
DE19838378A1 (en) * 1998-08-24 2000-03-02 Magnet Motor Gmbh Electric machine with permanent magnets
US6111329A (en) 1999-03-29 2000-08-29 Graham; Gregory S. Armature for an electromotive device
DE19925765A1 (en) * 1999-06-05 2000-12-07 Remus Hans Juergen A brushless external rotor motor and brushless external-rotor generator
DE19925764A1 (en) * 1999-06-05 2000-12-07 Remus Hans Juergen Brushless AC external rotor generator
US6703741B1 (en) 1999-09-20 2004-03-09 Ecoair Corp. Permanent magnet rotor portion for electric machines
DE10084941T1 (en) * 1999-09-20 2002-08-14 Ecoair Corp Permanent magnetic rotor section for electrical machines
FR2802358B1 (en) * 1999-12-08 2002-01-18 Centre Nat Rech Scient Motor / generator has reluctance excited and winding in the air gap
US6873085B2 (en) * 2001-05-16 2005-03-29 G & G Technology, Inc. Brushless motor
US6741007B2 (en) 2001-07-27 2004-05-25 Beacon Power Corporation Permanent magnet motor assembly having a device and method of reducing parasitic losses
JP2003070219A (en) * 2001-08-24 2003-03-07 Alps Electric Co Ltd Motor and disc apparatus
US6700251B2 (en) * 2001-11-06 2004-03-02 Citizen Electronics Co., Ltd. Vibrating device for axially vibrating a movable member
JP4089808B2 (en) * 2001-12-25 2008-05-28 ケミテック株式会社 Top off possible microcapsule magnetic migration display sheet
US20040071003A1 (en) * 2002-09-04 2004-04-15 G & G Technology, Inc. Split phase polyphase inverter
US20040174082A1 (en) * 2003-03-04 2004-09-09 Graham Gregory S. Multiple concentric coil motor
US7294947B2 (en) * 2004-03-01 2007-11-13 Flux Drive, Inc. Apparatus for transferring torque magnetically
WO2006008331A1 (en) 2004-07-19 2006-01-26 Rotatek Finland Oy Electric machine
US7750515B1 (en) * 2005-10-25 2010-07-06 Gabrys Christopher W Industrial air core motor-generator
US7791233B1 (en) 2007-10-24 2010-09-07 Attard Michael T High torque electric motor/flywheel
WO2009140746A3 (en) * 2008-05-23 2010-10-21 Associação Keppe & Pacheco Electromagnetic motor and equipment to generate work torque
KR100963745B1 (en) 2008-06-12 2010-06-14 한국전력공사 Motor or Generator having rotational core
US20110167914A1 (en) * 2008-06-27 2011-07-14 Jeffrey Earle Sutherland Integrated multi-sensor non-destructive testing
US20100304920A1 (en) * 2009-05-28 2010-12-02 Bernard Joseph Simon Hybrid Assembly , A Hybrid Power-Train , And A Method For Operating A Selectively Movable Assembly
KR101219745B1 (en) * 2010-03-22 2013-01-08 한국화학연구원 Removing apparatus for algae
US20160094096A1 (en) * 2012-03-20 2016-03-31 Linear Labs, Inc. Brushed Electric Motor/Generator
CN103378705B (en) * 2012-04-25 2016-09-28 刘羿辰 It can be adjusted to match the performance of the electromagnetic actuators converter
DE112015004041T5 (en) * 2014-09-04 2017-07-13 M-Link Co., Ltd. Seedless rotating electrical machine with a stator, which includes a cylindrical coil, and cooling method for
EP3118971B1 (en) * 2015-07-14 2018-05-02 Kabushiki Kaisha Toshiba Rotary electrical machine and vehicle
US20170187254A1 (en) 2015-08-11 2017-06-29 Genesis Robotics Llp Electric Machine
JP6005886B1 (en) * 2016-03-03 2016-10-12 株式会社エムリンク No core dynamoelectric machine and method cooling comprises a stator with a cylindrical coil

Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US295368A (en) * 1884-03-18 dennis
US497001A (en) * 1893-05-09 Rookes evelyn
US1227185A (en) * 1915-09-01 1917-05-22 Alfons H Neuland Induction device.
DE843866C (en) * 1948-10-02 1952-07-14 Siemens Ag Synchronous motor for small single phase
US3014139A (en) * 1959-10-27 1961-12-19 Gen Electric Direct-cooled cable winding for electro magnetic device
US3102964A (en) * 1961-04-13 1963-09-03 Black & Decker Mfg Co High-efficiency permanent magnet motor
US3128402A (en) * 1962-05-17 1964-04-07 Jr Owen D Amick Direct current generator
US3134037A (en) * 1960-10-21 1964-05-19 Napier & Son Ltd Motor with hydrodynamic supported rotor
US3275863A (en) * 1965-02-01 1966-09-27 Elliott M Norton Electric machine construction
US3312846A (en) * 1962-09-11 1967-04-04 Printed Motors Inc Electric rotating machines
DE1463833A1 (en) * 1963-02-20 1969-09-18 Circuit Res Company DC motor
US3538364A (en) * 1968-01-30 1970-11-03 Cem Comp Electro Mec Rotary electrical machine of direct or alternating current type
US3602749A (en) * 1970-02-20 1971-08-31 Ernie B Esters Dynamoelectric machine
US3663850A (en) * 1970-08-03 1972-05-16 Phelon Co Inc Field means for a dynamoelectric machine, magnet preassembly for use therein
US3729642A (en) * 1970-02-20 1973-04-24 E Esters Plural stator dynamoelectric machine
US3845338A (en) * 1974-02-20 1974-10-29 Transicoil Inc Direct current shell armature motor
US3858071A (en) * 1970-05-28 1974-12-31 Ibm High frequency, low inductance generator
US4015154A (en) * 1974-12-23 1977-03-29 Sony Corporation Motor and method for making same
CA1029788A (en) * 1973-09-11 1978-04-18 Westinghouse Electric Corporation Wound dynamoelectric machine cores and method of making the same
US4114057A (en) * 1976-12-06 1978-09-12 Esters Ernie B Dynamoelectric machine with inner and outer stators
US4128364A (en) * 1972-11-23 1978-12-05 Papst-Motoren Kg Radial flow fan with motor cooling and resilient support of rotor shaft
US4255494A (en) * 1979-04-25 1981-03-10 Allegheny Ludlum Steel Corporation Sintered ferromagnetic powder metal parts for alternating current applications
JPS5694938A (en) * 1979-12-27 1981-07-31 Matsushita Electric Ind Co Ltd Flat type magnet motor
US4321496A (en) * 1981-03-02 1982-03-23 General Electric Company Discoidal winding coil structure for axial gap dynamoelectric machines
JPS5762742A (en) * 1980-09-30 1982-04-15 Hitachi Ltd Rotor for induction motor
US4447947A (en) * 1980-11-13 1984-05-15 The United States Of America As Represented By The Secretary Of The Air Force Process for making fluid-cooled electrical conductor
US4451749A (en) * 1981-09-11 1984-05-29 Nippondenso Co., Ltd. AC Generator
US4517484A (en) * 1982-02-18 1985-05-14 Ateliers De Constructions Electriques De Charleroi (Acec) Double gap electric generating machines
US4719377A (en) * 1984-09-29 1988-01-12 Kabushiki Kaisha Toshiba Armature annular core
US4948999A (en) * 1981-05-21 1990-08-14 U.S. Philips Corporation Self-starting two-pole single-phase synchronous motor
US5004944A (en) * 1985-12-23 1991-04-02 Unique Mobility, Inc. Lightweight high power electromagnetic transducer
GB0009557D0 (en) 2000-04-19 2000-06-07 Brenmar Limited Secure delivery or collection systems

Family Cites Families (142)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US464026A (en) * 1891-12-01 Transformer and armature-core
US3125402A (en) * 1964-03-17 Xcx ch
US1456955A (en) * 1921-02-26 1923-05-29 Westinghouse Electric & Mfg Co Means for obtaining high momentary current
US2792511A (en) * 1954-03-17 1957-05-14 Westinghouse Electric Corp Oriented-punching cores for dynamoelectric machines
US3082337A (en) * 1955-09-26 1963-03-19 Parsons C A & Co Ltd Dynamo-electric machines
US3069557A (en) * 1957-06-06 1962-12-18 Texas Instruments Inc Function generator utilizing non-conducting side of a binary chain
FR1272083A (en) * 1960-08-03 1961-09-22 Electronique & Automatisme Sa Improvements to rotating electrical machines
US3121851A (en) * 1961-09-06 1964-02-18 Northrop Corp Electromagnetic transducer
US3237036A (en) * 1962-04-04 1966-02-22 Sulzer Ag Commutating dynamo-electric machine
US3322986A (en) * 1964-04-03 1967-05-30 Sperry Rand Corp Gyroscopic rotor
US3297891A (en) * 1964-06-03 1967-01-10 Gen Motors Corp Brushless direct current motor
US3396296A (en) * 1967-06-05 1968-08-06 Ernie B. Esters Electric motors and generators
US3518469A (en) * 1967-10-18 1970-06-30 Oerlikon Maschf Electrical driving arrangement including a flywheel
US3495114A (en) * 1968-06-14 1970-02-10 Vasily Mikhailovich Kz Cylindrical and disc stators for electrical machines having composite windings
US3567980A (en) * 1969-02-03 1971-03-02 Robertshaw Controls Co Reversible motor with axially moveable rotor
FR2036866A1 (en) * 1969-04-11 1970-12-31 Novosib Elektrotekh
US3566165A (en) * 1969-05-06 1971-02-23 Gen Motors Corp Electric vehicle drive motor
US3638056A (en) * 1970-06-24 1972-01-25 Paul Imris Electrical generation apparatus
US3659129A (en) * 1970-09-15 1972-04-25 Gen Electric Insulated bar dynamoelectric machine and method of forming
US3861484A (en) * 1971-02-01 1975-01-21 Kenneth E Joslin Hybrid vehicular power system
US3882950A (en) * 1972-07-11 1975-05-13 James Neil Strohlein Vehicle power system for limited vehicle movement without use of fuel
US3843338A (en) * 1972-12-08 1974-10-22 Beam Prod Mfg Co Gaseous fuel carburetor including improved metering and distribution systems
FR2247846B1 (en) * 1973-10-15 1980-05-09 Labavia
US3874472A (en) * 1974-01-25 1975-04-01 West Virginia High Bird Corp Battery powered vehicle drive
FR2268381B1 (en) * 1974-04-17 1980-01-04 Alsthom Cgee
DE2434347C2 (en) * 1974-06-25 1986-07-10 Bbc Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau, Ch
US3965382A (en) * 1974-10-03 1976-06-22 General Electric Company Rotor having balance weights
DE2460630B2 (en) * 1974-12-20 1976-09-30 Permanent-magnet DC machine
US4004167A (en) * 1975-01-29 1977-01-18 Magna Motors Corporation Permanent magnet stators
US4025831A (en) * 1975-02-18 1977-05-24 Webb Robert L Brushless direct current motor
JPS5246207U (en) * 1975-07-23 1977-04-01
US4065702A (en) * 1975-07-31 1977-12-27 Daniel Locker Drive system for high inertia load
JPS5346617A (en) * 1976-10-08 1978-04-26 Pioneer Electronic Corp Brushless motor
JPS5739447B2 (en) * 1976-10-27 1982-08-21
US4233858A (en) * 1976-12-27 1980-11-18 The Garrett Corporation Flywheel drive system having a split electromechanical transmission
US4169235A (en) * 1977-03-10 1979-09-25 Hitachi, Ltd. Electric motor with a built-up type rotor using tapered sections
US4110652A (en) * 1977-03-16 1978-08-29 General Electric Company Mounting assembly for laminated rotor rim of dynamoelectric generator rotatable about inclined shaft
US4149309A (en) * 1977-07-27 1979-04-17 Mitsui Mfg. Co., Ltd. Laminated core manufacture
DE7823164U1 (en) * 1977-08-03 1979-02-08 Micro Technology Laboratory Co., Ltd., Tokio Stabfoermiger formed as a solid body rotor
US4146809A (en) * 1977-09-15 1979-03-27 Westinghouse Electric Corp. Sleeve for a rotor of a dynamoelectric machine
DE2833168A1 (en) * 1977-10-10 1980-02-07 Siegfried Dipl Ing Haussmann Simple arrangement for rundown of ankerrueckwirkung in electrical machines
US4222450A (en) * 1978-04-13 1980-09-16 Hiram Fobbs Electrical drive for automobile
DE2824257C2 (en) * 1978-06-02 1986-04-17 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE2831123C2 (en) * 1978-07-12 1987-12-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
US4291457A (en) * 1978-08-09 1981-09-29 Marc Heyraud Method of making self-supporting rotor coil dc-machine
DE2901751C2 (en) * 1978-12-14 1988-08-04 Bbc Brown Boveri Ag, Baden, Aargau, Ch
JPS6259546B2 (en) * 1978-12-29 1987-12-11 Mitsubishi Electric Corp
FR2456416A1 (en) 1979-05-07 1980-12-05 Od Polt Institut Two-speed motor winding - has groups of coils non-uniformly distributed in slots for pole change compensation
US4264836A (en) * 1979-06-07 1981-04-28 Dukshtau A A Laminated rotor for a synchronous salient-pole electrical machine
DE2925798A1 (en) 1979-06-26 1981-02-05 Od Polt Institut Two-speed motor winding - has groups of coils non-uniformly distributed in slots for pole change compensation
US4289989A (en) * 1979-12-10 1981-09-15 Marathon Electric Manufacturing Corp. Brushless exciter rotor mounting
GB2075760A (en) * 1979-12-28 1981-11-18 Ibm Electric rotary actuators
CA1162458A (en) * 1980-02-20 1984-02-21 Heinz Annen Rotor for a hydroelectric machine
US4497001A (en) * 1981-07-03 1985-01-29 Clarion Co., Ltd. Auto-reverse mechanism for use in magnetic recording/reproducing apparatus
DE3031420A1 (en) 1980-08-18 1982-03-04 Siemens Ag Sealingly encapsulated electric machine - supplies primary recooling to sealed stator core rear side, forming throttle of single stage heat pump circuit
DE3031423C2 (en) 1980-08-18 1984-04-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
US4390806A (en) * 1980-09-02 1983-06-28 General Electric Company Dynamoelectric machine rotors with mechanical separators
US4484083A (en) * 1980-09-02 1984-11-20 Jefferies Peter N Electric drive train for a vehicle
US4327303A (en) * 1980-09-29 1982-04-27 Siemens-Allis, Inc. Rotor assembly for a dynamoelectric machine
US4434389A (en) * 1980-10-28 1984-02-28 Kollmorgen Technologies Corporation Motor with redundant windings
US4429245A (en) * 1980-11-19 1984-01-31 Papst Motoren Gmbh & Co., Kg External rotor production for synchronous hysteresis motor
JPS57126265A (en) * 1981-01-27 1982-08-05 Secoh Giken Inc Caulkingless cylindrical motor
US4508998A (en) * 1981-02-09 1985-04-02 David H. Rush Brushless disc-type DC motor or generator
DE3222338A1 (en) * 1981-08-07 1983-02-24 Arnegger Richard E Electric bell motor
US4469970A (en) * 1981-12-24 1984-09-04 General Electric Company Rotor for permanent magnet excited synchronous motor
US4427911A (en) * 1982-01-04 1984-01-24 Imc Magnetics Corp. Rotor for a stepper motor having a sheet metal support for the magnet
US4472650A (en) * 1982-02-11 1984-09-18 Advolotkin Nikolai P Rotor of high-speed electric machine
US4480206A (en) * 1982-03-08 1984-10-30 Imc Magnetics Corp. Motor having stationary shaft and method of assembling it
DE3218239A1 (en) * 1982-05-14 1983-11-17 Standard Elektrik Lorenz Ag DC machine
US4501980A (en) * 1982-06-04 1985-02-26 Motornetics Corporation High torque robot motor
US4447750A (en) * 1982-06-23 1984-05-08 International Scientific Industries, Inc. Electromagnetic device construction
DE3224904C2 (en) 1982-07-03 1986-11-06 Dornier System Gmbh, 7990 Friedrichshafen, De
DE3232914C1 (en) * 1982-09-04 1983-12-15 Uranit Gmbh Runners for a hysteresis motor
US4629921A (en) 1982-09-14 1986-12-16 Gavaletz John S Dynamoelectric machine rotor
US4471248A (en) * 1982-09-15 1984-09-11 U.S. Philips Corporation Electric motor with elastic vibration damping rotor to shaft coupling
JPS5959054A (en) * 1982-09-27 1984-04-04 Fanuc Ltd Permanent magnet field rotor structure
US4547713A (en) * 1982-11-05 1985-10-15 Kollmorgen Technologies Corporation Toroidally wound brushless DC motor
DE3243212A1 (en) * 1982-11-23 1984-05-24 Rau Swf Autozubehoer Small electric motor with an armature
US4550267A (en) * 1983-02-18 1985-10-29 Sundstrand Corporation Redundant multiple channel electric motors and generators
JPS59181956A (en) * 1983-03-31 1984-10-16 Oopack Kk Brushless dc rotary electric machine
CA1214205A (en) * 1983-04-15 1986-11-18 Giampiero Tassinario Commutatorless d.c. motor with electronic commutation
JPS648536B2 (en) 1983-04-20 1989-02-14 Fanuc Ltd
NL8301796A (en) 1983-05-20 1984-12-17 Philips Nv Adjustable electrical machine.
DE3420995C2 (en) * 1983-06-10 1985-08-08 Anton Piller Gmbh & Co Kg, 3360 Osterode, De
FR2548843B1 (en) 1983-07-07 1986-11-07 Labinal Improvement in rotating machines the rotor magnets
US4647804A (en) 1983-07-15 1987-03-03 Sundstrand Corporation High speed generator rotor oil path air vent
US4625135A (en) 1983-07-19 1986-11-25 The Garrett Corporation Permanent magnet rotor
JPS6366152B2 (en) * 1983-07-27 1988-12-19 Hitachi Ltd
DE3327744A1 (en) 1983-08-01 1985-02-21 Siemens Ag A method of balancing wound rotors of electric machines
US4553075A (en) * 1983-08-04 1985-11-12 Rotron Incorporated Simple brushless DC fan motor with reversing field
US4614888A (en) 1983-08-17 1986-09-30 Sundstrand Corporation Improved magnetic rotor
DE3331194A1 (en) 1983-08-30 1985-03-07 Mulfingen Elektrobau Ebm Brushless DC motor with three-strand, ungesehnter stator
US4486678A (en) * 1983-09-06 1984-12-04 Sundstrand Corporation Rotor for a permanent magnet generator
US4458168A (en) * 1983-09-12 1984-07-03 Motornetics Corporation Toothed reluctance synchro/resolver
US4453101A (en) * 1983-09-27 1984-06-05 General Electric Company Amortisseur bar with improved interface between free conductor bars and amortisseur ring
US4564793A (en) * 1983-09-28 1986-01-14 Rotron, Incorporated Brushless DC motor with improved starting
US4585967A (en) 1983-10-21 1986-04-29 General Electric Company Rotor of AC dynamoelectric machine with improved cooling and stability and method of making the same
US4486679A (en) * 1983-10-28 1984-12-04 General Electric Company Permanent magnet rotor and method of making same
US4556828A (en) * 1983-11-02 1985-12-03 Sanders Associates, Inc. Electric motor adapted to permit translational motion between field and armature
US4504755A (en) * 1983-11-03 1985-03-12 Kollmorgen Technologies Corporation Rotor reluctance notch for cogging control
US4531071A (en) * 1983-12-12 1985-07-23 Sundstrand Corporation Rotor assembly
FR2556897B1 (en) 1983-12-15 1988-06-17 Precilec DC motor brushless
US4587450A (en) 1984-01-06 1986-05-06 Sanyei Corporation Synchronous motor rotor
US4709179A (en) 1984-01-17 1987-11-24 Regie Nationale Des Usines Renault Permanent-magnet six-pole synchronous electrodynamic machine
JPH0452057B2 (en) 1984-02-07 1992-08-20 Hitachi Ltd
US4540906A (en) * 1984-03-09 1985-09-10 Synektron Corporation Stator assembly for permanent magnet rotary device
NL8400780A (en) 1984-03-12 1985-10-01 Philips Nv Rotor for an electrical machine.
DE3408986C2 (en) 1984-03-12 1988-06-09 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE3516380A1 (en) 1984-05-08 1985-11-14 Dso Elprom Rotor for an electrical machine
GB2159340B (en) 1984-05-08 1987-11-11 Dso Elprom An inductor for an electrical machine
JPS6118349A (en) 1984-07-05 1986-01-27 Mitsubishi Electric Corp Rotor of superconductive rotary electric machine
US4563622A (en) * 1984-07-12 1986-01-07 Rotron Incorporated Simple brushless DC fan motor
JPH0652984B2 (en) 1984-07-13 1994-07-06 株式会社日立製作所 A DC motor - armature
JPH0317583Y2 (en) 1984-08-17 1991-04-12
EP0175083B2 (en) 1984-09-07 1993-06-30 BBC Brown Boveri AG Stator coil conductor connecting device of an electrical machine
US4618792A (en) 1984-09-26 1986-10-21 Westinghouse Electric Corp. Dynamoelectric machine with a laminated pole permanent magnet rotor
US4608505A (en) 1984-12-17 1986-08-26 Larry Schumacher Commutatorless d.c. electric motor
US4672247A (en) 1984-12-27 1987-06-09 North American Philips Corporation Synchronous or stepping motor with equal-torque stepping
US4618806A (en) 1985-02-11 1986-10-21 Rotron, Inc. Ironless, brushless DC motor with wave-winding
JPH0452712B2 (en) 1985-02-26 1992-08-24 Mitsubishi Electric Corp
JPH0216098B2 (en) 1985-02-28 1990-04-16 Fanuc Ltd
US4639626A (en) 1985-04-26 1987-01-27 Magnetics Research International Corporation Permanent magnet variable reluctance generator
US4689532A (en) 1985-05-07 1987-08-25 Howlett James F Ferritic sensor, self-controlled synchronous motor
US4682069A (en) 1985-05-14 1987-07-21 Flygt Aktiebolag Key joint apparatus for assembly of electrical motors
DE3518694C2 (en) 1985-05-24 1988-12-22 Philips Patentverwaltung Gmbh, 2000 Hamburg, De
JPS61280752A (en) 1985-06-05 1986-12-11 Oopack Kk Brushless dc rotary electric machine
US4661737A (en) 1985-08-21 1987-04-28 The Curators Of The University Of Missouri Electrical machines with multiple axes of rotation
US4719381A (en) 1985-08-21 1988-01-12 The Curators Of The University Of Missouri Electrical machines and apparatus for rotation around multiple axes
US4609862A (en) 1985-09-09 1986-09-02 General Motors Corporation Twin winding three-phase alternator with zero slot coupling
US4633149A (en) 1985-09-10 1986-12-30 Buehler Products, Inc. Brushless DC motor
US4611137A (en) 1985-10-25 1986-09-09 Sundstrand Corporation Cooling of dynamoelectric machines
US4667125A (en) 1985-10-25 1987-05-19 General Electric Company Rotor slot insulation system for electrical machine and article incorporating same
US4731554A (en) 1985-11-14 1988-03-15 Allied Corporation Low profile ring-shaped motor
US4734606A (en) 1985-11-20 1988-03-29 Hajec Chester S Electric motor with ferrofluid bearing
US4631435A (en) 1985-12-18 1986-12-23 The Garrett Corporation Consequent pole permanent magnet rotor
GB8531212D0 (en) 1985-12-18 1986-01-29 Lynch C Electrical machines
US4678954A (en) 1986-03-05 1987-07-07 Kabushiki Kaisha Toshiba Rotor with permanent magnets having thermal expansion gaps
US4670680A (en) 1986-07-29 1987-06-02 R. F. Monolithics, Inc. Doubly rotated orientations of cut angles for quartz crystal for novel surface acoustic wave devices
US4694210A (en) 1986-07-31 1987-09-15 General Motors Corporation Brushless DC motor and sensorless drive arrangement therefor
US4670622A (en) 1986-09-18 1987-06-02 Livingston Jr Miles R Solar energy conversion apparatus and method
US4900965A (en) 1988-09-28 1990-02-13 Fisher Technology, Inc. Lightweight high power electromotive device
EP2342328B1 (en) 2008-10-03 2016-04-20 E. I. du Pont de Nemours and Company Enzymatic peracid generation formulation

Patent Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US295368A (en) * 1884-03-18 dennis
US497001A (en) * 1893-05-09 Rookes evelyn
US1227185A (en) * 1915-09-01 1917-05-22 Alfons H Neuland Induction device.
DE843866C (en) * 1948-10-02 1952-07-14 Siemens Ag Synchronous motor for small single phase
US3014139A (en) * 1959-10-27 1961-12-19 Gen Electric Direct-cooled cable winding for electro magnetic device
US3134037A (en) * 1960-10-21 1964-05-19 Napier & Son Ltd Motor with hydrodynamic supported rotor
US3102964A (en) * 1961-04-13 1963-09-03 Black & Decker Mfg Co High-efficiency permanent magnet motor
US3128402A (en) * 1962-05-17 1964-04-07 Jr Owen D Amick Direct current generator
US3312846A (en) * 1962-09-11 1967-04-04 Printed Motors Inc Electric rotating machines
DE1463833A1 (en) * 1963-02-20 1969-09-18 Circuit Res Company DC motor
US3275863A (en) * 1965-02-01 1966-09-27 Elliott M Norton Electric machine construction
US3538364A (en) * 1968-01-30 1970-11-03 Cem Comp Electro Mec Rotary electrical machine of direct or alternating current type
US3602749A (en) * 1970-02-20 1971-08-31 Ernie B Esters Dynamoelectric machine
US3729642A (en) * 1970-02-20 1973-04-24 E Esters Plural stator dynamoelectric machine
US3858071A (en) * 1970-05-28 1974-12-31 Ibm High frequency, low inductance generator
US3663850A (en) * 1970-08-03 1972-05-16 Phelon Co Inc Field means for a dynamoelectric machine, magnet preassembly for use therein
US4128364A (en) * 1972-11-23 1978-12-05 Papst-Motoren Kg Radial flow fan with motor cooling and resilient support of rotor shaft
CA1029788A (en) * 1973-09-11 1978-04-18 Westinghouse Electric Corporation Wound dynamoelectric machine cores and method of making the same
US3845338A (en) * 1974-02-20 1974-10-29 Transicoil Inc Direct current shell armature motor
US4015154A (en) * 1974-12-23 1977-03-29 Sony Corporation Motor and method for making same
US4114057A (en) * 1976-12-06 1978-09-12 Esters Ernie B Dynamoelectric machine with inner and outer stators
US4255494A (en) * 1979-04-25 1981-03-10 Allegheny Ludlum Steel Corporation Sintered ferromagnetic powder metal parts for alternating current applications
JPS5694938A (en) * 1979-12-27 1981-07-31 Matsushita Electric Ind Co Ltd Flat type magnet motor
JPS5762742A (en) * 1980-09-30 1982-04-15 Hitachi Ltd Rotor for induction motor
US4447947A (en) * 1980-11-13 1984-05-15 The United States Of America As Represented By The Secretary Of The Air Force Process for making fluid-cooled electrical conductor
US4321496A (en) * 1981-03-02 1982-03-23 General Electric Company Discoidal winding coil structure for axial gap dynamoelectric machines
US4948999A (en) * 1981-05-21 1990-08-14 U.S. Philips Corporation Self-starting two-pole single-phase synchronous motor
US4451749A (en) * 1981-09-11 1984-05-29 Nippondenso Co., Ltd. AC Generator
US4517484A (en) * 1982-02-18 1985-05-14 Ateliers De Constructions Electriques De Charleroi (Acec) Double gap electric generating machines
US4719377A (en) * 1984-09-29 1988-01-12 Kabushiki Kaisha Toshiba Armature annular core
US5004944A (en) * 1985-12-23 1991-04-02 Unique Mobility, Inc. Lightweight high power electromagnetic transducer
GB0009557D0 (en) 2000-04-19 2000-06-07 Brenmar Limited Secure delivery or collection systems

Cited By (88)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5864198A (en) * 1994-10-14 1999-01-26 Active Power, Inc. Brushless generator
US5783894A (en) * 1995-10-31 1998-07-21 Wither; Thomas A. Method and apparatus for generating electrical energy
US6037690A (en) * 1996-01-08 2000-03-14 Hill; Wolfgang Energy conversion system mounted in a wheel hub
US6297575B1 (en) * 1996-03-28 2001-10-02 Tai-Her Yang Combined power driven device having a three-layered electromechanical structure with common structures
US6065368A (en) * 1997-12-16 2000-05-23 Samsung Electronics Co., Ltd. Self-compensating dynamic balancer
US6049152A (en) * 1998-03-25 2000-04-11 Nissan Motor Co., Ltd. Motor/generator
US6201331B1 (en) * 1998-03-25 2001-03-13 Nissan Motor Co., Ltd. Motor/generator
EP1072084A4 (en) * 1998-04-16 2001-10-17 Ettridge John P Improved electric motor
EP1072084A1 (en) * 1998-04-16 2001-01-31 John Patrick Ettridge Improved electric motor
US6617748B2 (en) 1998-12-22 2003-09-09 Rush Holdings, Inc. Machine with cup-shaped armature and air gap
WO2000038297A1 (en) * 1998-12-22 2000-06-29 Rush Holdings, Inc. Machine with cup-shaped armature and air gap
US6776057B1 (en) * 1999-08-12 2004-08-17 Abas, Incorporated Magnetized transducer element for torque or force sensor
US20040021386A1 (en) * 1999-09-30 2004-02-05 Swett Dwight W. Axial gap motor-generator for high speed operation
US6633106B1 (en) 1999-09-30 2003-10-14 Dwight W. Swett Axial gap motor-generator for high speed operation
US6384507B1 (en) * 1999-11-10 2002-05-07 Korea Advanced Institute Of Science & Technology Coreless AC induction motor
DE19957008A1 (en) * 1999-11-26 2001-06-28 Sonderprojekte Anlagen & Hande Electric machine has hollow armature with at least one individual layer of one or more metals and has 'open' Fermi-surface to maximise interaction between magnetic field and electric current
US6891302B1 (en) 2000-09-23 2005-05-10 Christopher W. Gabrys Light-weight high-power electrical machine
US20080007070A1 (en) * 2000-11-15 2008-01-10 Edelson Jonathan S Chimney turbine
US8198746B2 (en) * 2000-11-15 2012-06-12 Borealis Technical Limited Chimney turbine
US20070222227A1 (en) * 2001-09-13 2007-09-27 High Technology Investments, Bv Wind power generator including blade arrangement
US20040232704A1 (en) * 2001-09-13 2004-11-25 Matteo Casazza Wind power generator
US7385305B2 (en) 2001-09-13 2008-06-10 Matteo Casazza Wind power generator and bearing structure therefor
US7893555B2 (en) 2001-09-13 2011-02-22 Wilic S.Ar.L. Wind power current generator
US20070222226A1 (en) * 2001-09-13 2007-09-27 High Technology Investments, Bv Wind power generator and bearing structure therefor
US20100140955A1 (en) * 2001-09-13 2010-06-10 High Technology Investments B.V. Wind power current generator
US7205678B2 (en) 2001-09-13 2007-04-17 Matteo Casazza Wind power generator
US20080315594A1 (en) * 2001-09-13 2008-12-25 High Technology Investments, Bv Wind power generator and bearing structure therefor
US7687932B2 (en) 2001-09-13 2010-03-30 High Technology Investments B.V. Wind power generator and bearing structure therefor
US7385306B2 (en) 2001-09-13 2008-06-10 Matteo Casazza wind power generator including blade arrangement
US6727632B2 (en) * 2001-11-27 2004-04-27 Denso Corporation Flat rotary electric machine
US20030102764A1 (en) * 2001-11-27 2003-06-05 Denso Corporation Flat rotary electric machine
US20050045392A1 (en) * 2002-07-31 2005-03-03 Maslov Boris A. In-wheel electric motors
US20040263099A1 (en) * 2002-07-31 2004-12-30 Maslov Boris A Electric propulsion system
US20050046375A1 (en) * 2002-07-31 2005-03-03 Maslov Boris A. Software-based adaptive control system for electric motors and generators
US20050127856A1 (en) * 2002-07-31 2005-06-16 Wavecrest Laboratories Low-voltage electric motors
US20040021437A1 (en) * 2002-07-31 2004-02-05 Maslov Boris A. Adaptive electric motors and generators providing improved performance and efficiency
US7888839B2 (en) * 2004-03-14 2011-02-15 Revolution Electric Motor Company, Inc. Commercial low cost, high efficiency motor-generator
US20080231131A1 (en) * 2004-03-14 2008-09-25 Gabrys Christopher W Commercial Low Cost, High Efficiency Motor-Generator
US7154191B2 (en) 2004-06-30 2006-12-26 General Electric Company Electrical machine with double-sided rotor
US7830063B2 (en) 2004-06-30 2010-11-09 General Electric Company Electrical machine with double-sided rotor
US20070281558A1 (en) * 2004-06-30 2007-12-06 Jansen Patrick L Electrical machine with double-sided rotor
US20060001269A1 (en) * 2004-06-30 2006-01-05 Jansen Patrick L Electrical machine with double-sided rotor
US7808149B2 (en) 2004-09-20 2010-10-05 Wilic S.Ar.L. Generator/electric motor, in particular for wind power plants, cable controlled plants or for hydraulic plants
US20070108865A1 (en) * 2004-09-27 2007-05-17 Jansen Patrick L Electrical machine with double-sided stator
US7154193B2 (en) 2004-09-27 2006-12-26 General Electric Company Electrical machine with double-sided stator
US7154192B2 (en) * 2004-09-27 2006-12-26 General Electric Company Electrical machine with double-sided lamination stack
US20060071575A1 (en) * 2004-09-27 2006-04-06 General Electric Company Electrical machine with double-sided stator
US20060066110A1 (en) * 2004-09-27 2006-03-30 General Electric Company Electrical machine with double-sided lamination stack
US7548008B2 (en) 2004-09-27 2009-06-16 General Electric Company Electrical machine with double-sided lamination stack
US7839048B2 (en) 2004-09-27 2010-11-23 General Electric Company Electrical machine with double-sided stator
US20070103027A1 (en) * 2004-09-27 2007-05-10 Jansen Patrick L Electrical machine with double-sided lamination stack
US7411325B1 (en) * 2004-10-20 2008-08-12 Revolution Electric Motor Company, Inc. High efficiency combination motor and drive
US20060131985A1 (en) * 2004-12-16 2006-06-22 General Electric Company Electrical machines and assemblies including a yokeless stator with modular lamination stacks
US7692357B2 (en) 2004-12-16 2010-04-06 General Electric Company Electrical machines and assemblies including a yokeless stator with modular lamination stacks
US20070241623A1 (en) * 2005-08-08 2007-10-18 Caiozza Joseph C Wind driven electric generator apparatus
US7569963B2 (en) * 2005-08-08 2009-08-04 Joseph C. Caiozza Wind driven electric generator apparatus
US7402934B1 (en) * 2005-08-18 2008-07-22 Revolution Motor Company, Inc. High performance air core motor-generator winding
US7946591B2 (en) 2005-09-21 2011-05-24 Wilic S.Ar.L. Combined labyrinth seal and screw-type gasket bearing sealing arrangement
US20080244895A1 (en) * 2005-09-28 2008-10-09 Itt Manufacturing Enterprises Inc. Method For Mounting Magnet Elements on a Rotor For Use In a Permanent Magnet Motor
US7761976B2 (en) * 2005-09-28 2010-07-27 Itt Manufacturing Enterprises Inc. Method for mounting magnet elements on a rotor for use in a permanent magnet motor
US7936102B2 (en) 2005-11-29 2011-05-03 Wilic S.Ar.L Magnet holder for permanent magnet rotors of rotating machines
US8310122B2 (en) 2005-11-29 2012-11-13 Wilic S.A.R.L. Core plate stack assembly for permanent magnet rotor or rotating machines
US7902700B1 (en) * 2006-04-03 2011-03-08 Gabrys Christopher W Low harmonic loss brushless motor
US20100026010A1 (en) * 2006-12-22 2010-02-04 High Technology Investments B.V. Multiple generator wind turbine
US20080157613A1 (en) * 2007-01-03 2008-07-03 Terry Scott Permanent Magnet Electric Generator with Rotor Circumferentially Encircling Stator
US7592736B2 (en) * 2007-01-03 2009-09-22 Terry Scott Permanent magnet electric generator with rotor circumferentially encircling stator
US20090010784A1 (en) * 2007-07-06 2009-01-08 Mbs Engineering, Llc Powdered metals and structural metals having improved resistance to heat and corrosive fluids and b-stage powders for making such powdered metals
US9312741B2 (en) 2008-06-19 2016-04-12 Windfin B.V. Wind power generator equipped with a cooling system
US8492919B2 (en) 2008-06-19 2013-07-23 Wilic S.Ar.L. Wind power generator equipped with a cooling system
US8120198B2 (en) 2008-07-23 2012-02-21 Wilic S.Ar.L. Wind power turbine
US8319362B2 (en) 2008-11-12 2012-11-27 Wilic S.Ar.L. Wind power turbine with a cooling system
US8669685B2 (en) 2008-11-13 2014-03-11 Wilic S.Ar.L. Wind power turbine for producing electric energy
US8272822B2 (en) 2009-01-30 2012-09-25 Wilic S.Ar.L. Wind power turbine blade packing and packing method
US8274170B2 (en) 2009-04-09 2012-09-25 Willic S.A.R.L. Wind power turbine including a cable bundle guide device
US8659867B2 (en) 2009-04-29 2014-02-25 Wilic S.A.R.L. Wind power system for generating electric energy
US8410623B2 (en) 2009-06-10 2013-04-02 Wilic S. AR. L. Wind power electricity generating system and relative control method
US8810347B2 (en) 2009-08-07 2014-08-19 Wilic S.Ar.L Method and apparatus for activating an electric machine, and electric machine
US8358189B2 (en) 2009-08-07 2013-01-22 Willic S.Ar.L. Method and apparatus for activating an electric machine, and electric machine
US8618689B2 (en) 2009-11-23 2013-12-31 Wilic S.Ar.L. Wind power turbine for generating electric energy
US8541902B2 (en) 2010-02-04 2013-09-24 Wilic S.Ar.L. Wind power turbine electric generator cooling system and method and wind power turbine comprising such a cooling system
US8937397B2 (en) 2010-03-30 2015-01-20 Wilic S.A.R.L. Wind power turbine and method of removing a bearing from a wind power turbine
US8975770B2 (en) 2010-04-22 2015-03-10 Wilic S.Ar.L. Wind power turbine electric generator and wind power turbine equipped with an electric generator
US8937398B2 (en) 2011-03-10 2015-01-20 Wilic S.Ar.L. Wind turbine rotary electric machine
US8957555B2 (en) 2011-03-10 2015-02-17 Wilic S.Ar.L. Wind turbine rotary electric machine
US9006918B2 (en) 2011-03-10 2015-04-14 Wilic S.A.R.L. Wind turbine
US20130088103A1 (en) * 2011-10-05 2013-04-11 Industrias Metalurgicas Pescarmona S.A.I.C. Y F. Synchronic Wind Turbine Generator
US20150244233A1 (en) * 2012-09-13 2015-08-27 Toyota Jidosha Kabushiki Kaisha Stator of rotating electric machine
US9716414B2 (en) * 2012-09-13 2017-07-25 Toyota Jidosha Kabushiki Kaisha Stator of rotating electric machine

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JPS62189954A (en) 1987-08-19 application
ES2029448T3 (en) 1992-08-16 grant
EP0230639A2 (en) 1987-08-05 application
FI865263D0 (en) grant
FI102864B (en) 1999-02-26 application
EP0230639B1 (en) 1992-01-02 grant
EP0230639B2 (en) 1996-06-05 grant
FI102864B1 (en) 1999-02-26 grant
CA1312646C (en) 1993-01-12 grant
DK622986D0 (en) 1986-12-22 grant
CN86108648A (en) 1987-09-30 application
DK173855B1 (en) 2001-12-27 grant
FI865263A (en) 1987-06-24 application
DE3683278D1 (en) 1992-02-13 grant
US5004944A (en) 1991-04-02 grant
KR950010879B1 (en) 1995-09-25 grant
RU2083051C1 (en) 1997-06-27 grant
ES2029448T5 (en) 1996-11-01 grant
EP0230639A3 (en) 1987-08-19 application
DK622986A (en) 1987-06-24 application
CN1044541C (en) 1999-08-04 grant
FI865263A0 (en) 1986-12-22 application
JP2831348B2 (en) 1998-12-02 grant

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